Fresh Air
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Senior User
Joined: Jun 2005
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Fresh Air
The installation of the Cummins into my '68 Highboy required such a large 'hump' in the firewall that the heater box had to go. So now I'm stuck with the fresh air supply whole in the passenger side kick plate and I'm trying to figure out what to do with it. Can I use the same slide that is on the driver's side and install it over the whole? I looked online and didn't see that slide for sale anywhere - just the gasket.
Eventually I'm going to install a Vintage Air in where the heater box was. Does anyone have any idea if the original ducting that supplied the heater box with fresh air would be us use installing the Vintage Air?
Peter
Eventually I'm going to install a Vintage Air in where the heater box was. Does anyone have any idea if the original ducting that supplied the heater box with fresh air would be us use installing the Vintage Air?
Peter
Fleet Mechanic
Joined: Dec 2006
Posts: 1,338
Likes: 6
From: UPSTATE NY
if i want fresh air i open my window. that duct that goes on the passenger side is an enemy imo. why would you want to heat cold air? or cool hot air? if everything is recirculating inside the cab thats what makes me comfortable. because if the outside air is 5 degrees and your heating that, it aint the same as heating maybe 60 degree air inside the cab. assuming u live up north... i did for awhile.
Senior User
Joined: Jul 2003
Posts: 262
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From: Upstate South Carolina
The installation of the Cummins into my '68 Highboy required such a large 'hump' in the firewall that the heater box had to go. So now I'm stuck with the fresh air supply whole in the passenger side kick plate and I'm trying to figure out what to do with it. Can I use the same slide that is on the driver's side and install it over the whole? I looked online and didn't see that slide for sale anywhere - just the gasket.
Eventually I'm going to install a Vintage Air in where the heater box was. Does anyone have any idea if the original ducting that supplied the heater box with fresh air would be us use installing the Vintage Air?
Peter
Eventually I'm going to install a Vintage Air in where the heater box was. Does anyone have any idea if the original ducting that supplied the heater box with fresh air would be us use installing the Vintage Air?
Peter
Just wanted to give you some solidarity.
The CTD into a Ford truck = win!!!
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Senior User
Joined: Jun 2005
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Thanks for all the help. I'll email you Mike.
The Cummins is a great engine. I had a fairly built 390 in the HighBoy before and there is absolutely no comparison between the two. And having the 48RE behind it instead of a C6 makes a lot of difference too.
Peter
The Cummins is a great engine. I had a fairly built 390 in the HighBoy before and there is absolutely no comparison between the two. And having the 48RE behind it instead of a C6 makes a lot of difference too.
Peter
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Post Fiend
Joined: Sep 2007
Posts: 6,221
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From: Cow Town, CA
i also dont have a heater, but the PO did what Dave would like. he blocked off the pasage with a metal plate that he glued in place. if you decide that you dont want to put a driver side vent in let me know and i will take some pics for you.
but i might just have to check out the idea of putting in a driver side box.
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I just replaced my factory AC box with an after market one - long story - and was going to block off the outside duct as well. I thought what the hay lets see if it fits... even the bolt holes fit. You do need to add / drill two holes for the front screws... which i have yet to do.
You really want to use heated outside air when it is cold outside cause it is drier than the inside air. Heating inside are will fog the windows on a cold day.
By the way the room under the dash is pritty tight for the aftermarket AC unit... but is can be done.
Steve
You really want to use heated outside air when it is cold outside cause it is drier than the inside air. Heating inside are will fog the windows on a cold day.
By the way the room under the dash is pritty tight for the aftermarket AC unit... but is can be done.
Steve
Fleet Mechanic
Joined: Dec 2006
Posts: 1,338
Likes: 6
From: UPSTATE NY
wierd. that would only happen to me when it rained. all other times was fine and the heater really kicks butt. with the stock duct setup theres only 2 positions on that thing with the boot. open = cold air going thru vents, and closed = cold air hitting the passengers foot. i remember i would have the fan off and be driving 50 mph and i can feel air coming out of the vents and i'm like damnit!
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